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Usage : my $weights = $member->weights();
Function: Get or set some weights for this object. Weights represent how biased
the sampling of this organism is. For example, when random shotgun
sequencing microorganisms in the environment, the relative abundance
of reads in the sequence library is not proportional to the relative
abundance of the genomes because larger genomes contribute
disproportionalely more reads than small genomes. In such a case, you
could set the weight to the length of the genome. Do not attempt to
change weights after a member has been added to a community!
Note: Do not use a weight value of zero, except temporarily, and make
sure to give a proper weight (>0) before adding a member to a community.
Args : An arrayref of positive integers
Returns : An arrayref of positive integers